Agilent responded to the U1272A problems within 3 weeks, and have a nice present for all current owners to boot. Mini rant time too - Manufacturers take note, this is how you respond to problems and keep customers happy. Here is the Agilent notice: http://cp.literature.agilent.com/litweb/pdf/U1272A-02.pdf
FLUKE RESPONSE: No surprise really, Fluke have responded. I got a call from them and they have not only fixed the GSM problem (official explanation, they found a few RF sensitive components), but a new revision board is being tested as we speak. I'll hope to have a lot more on this a later date... So although they didn't get back to us on the progress, they have been head down bum up fixing it. Good to see!